<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>系统升级中</title>
</head>
<body>
    <div style="margin: auto;height: 37rem">
        <p style="
    font-size: 3rem;
    text-align: center;
    margin-top: 16rem;
">系统升级中，请稍候，大约需要5分钟</p>
    </div>
</body>
</html>